A child and sled with a combined mass of 48.0 kg slide down a frictionless slope. If the sled starts from rest and has a speed of 2.50 m/s at the bottom, what is the height of the hill?
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- A 108 kg man is skiing across level ground at a speed of 9.5 m/s when he comes to the small slope 1.2 m higher than ground level shown in the following figure. -8.0 m- f1.2 m (a) If the skier coasts up the hill, what is his speed (in m/s) when he reaches the top plateau? Assume friction between the snow and skis is negligible. 8.16 m/s (b) What is his speed (in m/s) when he reaches the upper level if a 75 N frictional force acts on the skis? 6.31 X m/sa girl and her bicycle have a total mass of 60kg. at the top of the hill her speed is 5.0m/s. The hill is 5.0 m high and 100 m long. If the force of friction as she rides down the hill is 20N, what is her speed at the bottom?In the figure below, a block slides along a path that is without friction until the block reaches the section of length L = 0.80 m, which begins at height h = 2.0 m on a ramp of angle = 30°. In that section, the coefficient of kinetic friction is 0.55. The block passes through point A with a speed of 8.0 m/s. If the block can reach point B (where the friction ends), what is its speed there, and if it cannot, what is its greatest height above A? m/s BA O Ꮎ
- I place a 10 kg box at the top of a ramp that is inclined at 25 degrees. It then slides 8 m down the incline. If the incline has a coefficient of kinetic friction of 0.3, what is the speed of the block after it has completed its 8 m slide?A 60.0 kg skier with an initial speed of 15 m/s coasts up a 2.50 m high rise as shown in the figure. what is her final speed given the coefficient of friction between her skies and the snow is 0.39A curling stone has a mass of 18.0 kg. The stone begins initially at rest on a flat ice surface. It is then pushed by a curler at a constant horizontal force of magnitude 24.0 N over a distance of 4.00 m. If you were to make any friction between the stone and ice negligible, what would the speed of the stone be at the end of the push when considering the conservation of energy of the stone.
- A child and sled with a combined mass of 58.0 kg slide down a frictionless slope. If the sled starts from rest and has a speed of 2.00 m/s at the bottom, what is the height of the hill?An object with a mass of 12.5 kg is moving along a rough horizontal surface. At a certain point it has 66 J of kinetic energy. If the coefficient of friction between the object and the surface is 0.44, how far will the object go beyond that point before coming to a stop? Express your answer in meters, to at least one digit after the decimal point. plz help and use g = 9.8A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 81 kg, and the height of the water slide is 11.8 m. If the kinetic frictional force does -5.1 × 103 J of work, how fast is the student going at the bottom of the slide?
- Maria sets up a simple track for her toy block (m = 0.30 kg) as shown in the figure below. She holds the block at the top of the track, 0.54 m above the bottom, and releases it from rest. (a) Neglecting friction, what is the speed of the block when it reaches the bottom of the curve (the beginning of the horizontal section of track)? m/s(b) If friction is present on the horizontal section of track and the block comes to a stop after traveling 0.80 m along the bottom, what is the magnitude of the friction force acting on the block? NThe concepts in this problem are similar to those in Multiple-Concept Example 4, except that the force doing the work in this problem is the tension in the cable. A rescue helicopter lifts a 90.5-kg person straight up by means of a cable. The person has an upward acceleration of 0.512 m/s2 and is lifted from rest through a distance of 8.89 m. (a) What is the tension in the cable? How much work is done by (b) the tension in the cable and (c) the person's weight? (d) Use the work-energy theorem and find the final speed of the person.A 3 kg block is sliding across a horizontal surface. The initial speed of the block is 4 m/s, but because of friction the block’s speed will decrease at a constant rate (i.e., constant acceleration) until the block finally comes to a stop after sliding 8 m. What is the average power (in W) supplied by friction as the block slows to a stop?